i don't know if im pregnant

[inocence03]

ive been haveing little cramps in my lower abdomen, my back hurts a little bit, im more tired then usual, and i get nausea but it goes after i eat. my last period was about a day then the next day it was just some spotting. i don't have tender breats. i had sex about 3 weeks ago, i took a test but it was negative.